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<h2>disk_read</h2>
<p>The disk_read function reads sector(s) from the disk drive.</p>
<pre>
DRESULT disk_read (
  BYTE <em>Drive</em>,          /* Physical drive number */
  BYTE* <em>Buffer</em>,        /* Pointer to the read buffer */
  DWORD <em>SectorNumber</em>,  /* Sector number to read from */
  BYTE <em>SectorCount</em>     /* Number of sectros to read */
);
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<div class="para">
<h4>Parameters</h4>
<dl class="par">
<dt>Drive</dt>
<dd>Specifies the physical drive number to read.</dd>
<dt>Buffer</dt>
<dd>Pointer to the read buffer to store the read data. <tt>SectorCount * 512</tt> bytes is required for the size of the read buffer.</dd>
<dt>SectorNumber</dt>
<dd>Specifies the start sector number in logical block address.</dd>
<dt>SectorCount</dt>
<dd>Specifies number of sectors to read. The value can be 1 to 255.</dd>
</dl>
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<div class="para">
<h4>Return Value</h4>
<dl class="ret">
<dt>RES_OK (0)</dt>
<dd>The function succeeded.</dd>
<dt>RES_ERROR</dt>
<dd>Any error occured during the read operation.</dd>
<dt>RES_PARERR</dt>
<dd>Invalid parameter.</dd>
<dt>RES_NOTRDY</dt>
<dd>The disk dirve has not been initialized.</dd>
</dl>
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